Well I decided to give the meaties a go. Picked up 10 White Rock X day old chicks on 15 August. Lost one at 5 weeks, one at 9 weeks and one 2 days before processing. I wanted to process them at 9 weeks but the abattoir couldn't fit me in, I left it too late. Ended up going 10 weeks. 7 birds, the smallest was 7.6 lbs and the largest 10.8 lbs dressed. If you loose 25% during processing that makes the big bird 14.5 lbs live!!.
We had the big one tonight for dinner. The best tasting chicken ever and lots left over.
So the experiment worked and my wife is so impressed we are getting a dozen layers in spring, plus turkeys and two batches of 30 meat chickens.
A big thanks to BigRedFeather for answering my questions.

We had the big one tonight for dinner. The best tasting chicken ever and lots left over.
So the experiment worked and my wife is so impressed we are getting a dozen layers in spring, plus turkeys and two batches of 30 meat chickens.
A big thanks to BigRedFeather for answering my questions.